Chris's AIX Blog

Further to my previous post on viostat, Dan Braden (from IBM ATS) provided me with one of his new presentations; Monitoring, Measuring Bandwidth And Tuning SAN Storage From AIX . In this document Dan presents several ways for monitoring virtual FC adapter usage statistics.

I just saw your article in your blog on the subject. There are 3 ways to look at real FC adapter thruput that I'm aware of:

interactive nmon then press ^

nmon recordings run thru the NMON analyzer

fcstat

Slide 45 shows an example where I had only NPIV traffic flowing thru the adapters and I used the "^" and "a" commands in interactive nmon to show both reports. The FC adapter report (getting its statistics from the adapter driver) shows the real thruput, while the adapter report (getting its statistics from the hdisk driver) doesn't show any IO.”

Dan sent a follow up email stating:

“....there is now a new option for fcstat (the -n <WWPN> option) which will display the statistics for a virtual port on the adapter. “

In the most recent VIOS version (2.2.2.2) the fcstat command has been updated to support new options. The -n flag can display the statistics on a virtual port level specified by the WWPN of the virtual adapter, for example:

$ fcstat -n C050760547E90000 fcs0

The -client flag will display the statistics of the virtual adapter per client, for example: